Detection of QTLs for Important Agronomic Traits and Analysis of Their Stabilities Using SSSLs in Rice

Published Date
July 2007, Vol.6(7):769–778, doi:10.1016/S1671-2927(07)60111-4

Author 

ZHAO Fang-ming ^*,

ZHU Hai-tao

DING Xiao-hua

ZENG Rui-zhen

ZHANG Ze-min

LI Wen-tao

ZHANG Gui-quan ^,

Guangdong Provincial Key Laboratory of Plant Molecular Breeding, South China Agricultural University, Guangzhou 510642, P.R. China

Available online 29 July 2007. 

Abstract

Single segment substitution lines (SSSLs) each with a single chromosome segment from a donor under the same genetic background as the recipient were developed in rice by advanced backcrossing and molecular marker-assisted selection. Using the SSSLs, the QTLs for the important agronomic traits in rice would be detected under different environmental conditions. Detection of the QTLs controlling 22 important traits in rice was done with 32 SSSLs by the randomized block design in 2–4 cropping seasons. 59 QTLs were detected and distributed on chromosomes 1, 2, 3, 4, 6, 7, 8, 10, and 11, of which 18 QTLs were detected more than twice. Only 30.5% of the QTLs were detected repeatedly in different cropping seasons. Most of the QTLs of important agronomic traits were of little additive effects and instability. The QTLs controlling the traits, such as grain weight, grain length, ratio of grain length to width, and heading date were relatively stable. The stable QTLs usually had larger additive effects and were less affected by environment. The QTLs for the important agronomic traits were detected using the SSSLs in rice with high resolution under different environmental conditions. The instability of the QTLs may be the basis of the variation of rice plants during growth and development. It would be the genetic basis for improving yield and quality in rice cultivars by farming methods.

Key words

rice

single segment substitution line

quantitative trait locus

agronomic trait

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• This paper is translated from its Chinese version in Scientia Agricultura Sinica.

• **
  Correspondence ZHANG Gui-quan, Professor

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